Adopting magnetic suspension principle,use the electromagnetic motion when rising in testing the key-press,while falling,adopt the magnetic forceto be the pressure for exact adjustment,eliminate the influence of the  increasing measured value of testing becase of the acceleration by self-weight inertia and motion work,turly reflect the real life-long.Theis machine adopting Ardal tank bracket glass for workplace,looking laconic in the QC section,(we can supply dial gauge)